CN111442451A - Variable working condition fresh air handling unit aiming at dynamic fluctuation of pollution concentration and operation control method thereof - Google Patents

Abstract

The invention discloses a variable working condition fresh air unit for the dynamic fluctuation of pollution concentration, comprising a casing, the casing is divided into a primary filter section, a surface cooling section, a variable working condition section and an air outlet section in sequence along the flow direction of the fresh air. The variable working condition section is composed of a low resistance air section and a deep purification air section. The deep purification air section is provided with a main filter, and a particle concentration sensor is set in front of the air inlet of the variable working condition section, which enters from the fresh air inlet. According to the degree of pollution detected by the particle concentration sensor, the fresh air in the chassis all enters the low resistance air section or all enters the deep purification air section, or a part enters the low resistance air section, while the other part enters the deep purification air section. By changing the structure of the fresh air unit and the purification process, the invention can effectively filter the biological aerosols generated by the surface cooler on the basis of realizing the operation of the fresh air unit under variable working conditions, and reduce the replacement frequency of the main filter and the efficiency of the entire system. resistance, effectively reducing system energy consumption and maintenance costs.

Description

A variable working condition fresh air unit and its operation control aiming at the dynamic fluctuation of pollution concentration method

technical field

The invention belongs to the technical field of air treatment equipment, and in particular relates to a variable working condition fresh air unit and an operation control method for the dynamic fluctuation of pollution concentration.

Background technique

Aerosol pollution of indoor air (including bioaerosols) is a growing concern. Traditional air-conditioning technologies and equipment operate under fixed operating conditions for air purification, which cannot adapt to the violent fluctuations in outdoor particulate matter concentrations in cities throughout the year, nor can they respond to emergencies in the epidemic, resulting in low efficiency of existing air-conditioning units or filtration systems. To ensure the purification effect when the air pollution is serious or the epidemic occurs, or the filter system has large resistance, high energy consumption for system operation, and frequent filter replacement, resulting in high maintenance costs.

In view of the above technical problems, in the prior art, the invention patent (publication number CN103267326A) discloses a fresh air system and its operation control method for improving indoor air cleanliness. By setting a bypass fresh air system, it can control indoor air in haze weather. Environmental particulate matter pollution does not increase the resistance of the air-conditioning system in normal working conditions, and the operation is economical and the control is simple and convenient; the invention patent (publication number CN103322628A) discloses an air-conditioning box and its operation method for controlling indoor air pollution in haze days. The fresh air filter section is divided into independent upper and lower fresh air ducts. Under normal working conditions, fresh air enters the mixing section from the lower fresh air duct, while in haze weather conditions, fresh air enters the mixing section from the upper fresh air duct. , so as to achieve the control of particulate matter pollution in the indoor environment in haze weather, without increasing the resistance of the air conditioning system in normal working conditions, economical operation and simple and convenient control.

However, the above two patents both place the main filter at the front end of the surface cooler, which cannot effectively filter the biological aerosols generated by the surface cooler. At the same time, the air to be treated must pass through the main filter, which cannot effectively reduce the main filter. Frequent replacement and resistance of the entire system, resulting in high system energy consumption.

SUMMARY OF THE INVENTION

The purpose of the present invention is to: in view of the above-mentioned problems, to provide a variable working condition fresh air unit and its operation control method which can reduce the replacement frequency of the main filter and effectively filter the biological aerosol for the dynamic fluctuation of the pollution concentration.

The technical scheme of the technology of the present invention is realized as follows: a fresh air unit with variable working conditions for dynamic fluctuation of pollution concentration, including a chassis, the two ends of the chassis are respectively the fresh air inlet and the fresh air outlet, and it is characterized in that: the chassis is along the The flow direction of the fresh air is divided into a primary filter section, a surface cooling section, a variable working condition section and an air outlet section. The variable working condition section consists of a low resistance air section and a deep purification air section. The filter is provided with a particulate matter concentration sensor in front of the air inlet of the variable working condition section. The fresh air entering the chassis from the fresh air inlet will all enter the low resistance air section or all enter the deep purification air according to the pollution degree detected by the particulate matter concentration sensor. A section or a part enters the low resistance air section, while the other part enters the deep purification air section.

In the variable working condition fresh air unit for the dynamic fluctuation of pollution concentration according to the present invention, the primary filter section includes a primary filter and an intermediate filter arranged in the chassis. The primary filter and the intermediate filter They are arranged at intervals along the flow direction of the fresh air, that is, the fresh air entering the chassis from the fresh air inlet is filtered through the primary filter and the intermediate filter in turn.

In the variable working condition fresh air unit according to the present invention for the dynamic fluctuation of pollution concentration, the surface cooling section includes a surface cooler arranged in the chassis, and the fresh air filtered by the primary filter section is sent to the surface cooling section of the surface cooling section. device for processing.

In the variable working condition fresh air unit according to the present invention, a humidification section is arranged between the surface cooling section and the variable working condition section, and the humidification section includes a humidifier arranged in the cabinet, so The fresh air in the cabinet is subjected to heat and humidity treatment through the surface cooling section and the humidification section.

In the variable working condition fresh air unit according to the present invention for the dynamic fluctuation of pollution concentration, the air outlet section includes a first fan arranged in the chassis, and the first fan is used for the fresh air discharged through the variable working condition section from the Fresh air is sent out.

In the variable working condition fresh air unit for dynamic fluctuation of pollution concentration according to the present invention, the low-resistance wind section includes a low-resistance channel and a first air valve and a second air valve disposed at the openings at both ends of the low-resistance channel.

In the variable working condition fresh air unit according to the present invention for dynamic fluctuation of pollution concentration, the deep purification air section includes a deep purification channel, a main filter, a third air valve and a second fan arranged in the deep purification channel. The third air valve is arranged at the air inlet end of the deep purification passage, and the second fan is arranged at the air outlet end of the deep purification passage, and is used to discharge the fresh air filtered by the main filter out of the deep purification passage.

In the variable working condition fresh air unit according to the present invention for the dynamic fluctuation of the pollution concentration, the low resistance air section and the deep purification air section of the variable working condition section are arranged along the axial direction of the chassis and separated into mutually independent ventilation channels, so The cross-sectional area A ₁ of the deep purification channel is larger than the cross-sectional area A ₂ of the low-resistance channel.

The operation control method for the variable working condition fresh air unit with the dynamic fluctuation of the pollution concentration according to the present invention is characterized in that: the specific control method is:

In normal working conditions, close the third air valve, open the first air valve and the second air valve, the fresh air first enters the unit from the fresh air inlet, and is purified by the primary filter and the intermediate filter in turn, and then passes through the surface cooling section. The fresh air is heated and humidified with the humidification section, and then all the air enters the air outlet section through the low resistance air section, and is sent out from the fresh air outlet through the first fan;

Under moderate pollution conditions, according to the air particle concentration detected by the particle concentration sensor, adjust the opening of the first air valve, the second air valve and the third air valve, and start the second fan, and the fresh air first enters from the fresh air inlet. The unit is purified by the primary filter and the medium-efficiency filter in turn, and then the fresh air is treated with heat and humidity through the surface cooling section and the humidification section. After the air in the deep purification channel is filtered by the main filter, it is sent out by the second fan and mixed with the air in the low-resistance channel in the air outlet section, and then sent out from the fresh air outlet through the first fan;

In the case of heavy pollution, close the first air valve and the second air valve, open the third air valve, and start the second fan. After purification, the fresh air is subjected to heat and humidity treatment through the surface cooling section and humidification section, and then all the air flows through the deep purification channel, and after being filtered by the main filter, it is sent to the air outlet section by the second fan, and passed through the first fan. Sent from the fresh air outlet.

The method for determining the cross-sectional area A ₁ of the deep purification channel in the variable working condition fresh air unit for the dynamic fluctuation of the pollution concentration according to the present invention is:

In the formula, Q is the total air volume of the fresh air unit; V ₁ is the surface wind speed of the main filter;

The method for determining the cross-sectional area _A of the low-resistance channel is:

In the formula, Q is the total air volume of the fresh air unit; V ₂ is the wind speed of the low resistance channel;

When running under moderate pollution conditions, according to the concentration of air particles detected by the particle concentration sensor as C ₀ , by adjusting the opening of the first air valve, the second air valve and the third air valve, and adjusting the operating frequency of the second fan , so that the air flow of the deep purification channel is Q ₁ , the air flow of the low resistance channel is Q ₂ , and the requirements of the following formulas are met:

Q=Q ₁ +Q ₂

In the formula, C _n is the concentration of air particles sent into the room by the fresh air outlet; η _z is the efficiency of the main filter; C _b is the standard allowable particle concentration.

The invention is mainly aimed at changing the working conditions of the dynamic fluctuation of the pollution concentration. By changing the structure of the fresh air unit and the purification process, on the basis of realizing the operation of the fresh air unit under the changing working conditions, the biological aerosol that may breed in the surface cooler can be effectively filtered. , and during the operation of the unit, not all the air under working conditions needs to be filtered by the main filter, which can effectively reduce the replacement frequency of the main filter and the resistance of the entire system according to the requirements of the working conditions, and effectively reduce the system performance. consumption and maintenance costs.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

FIG. 2 is a flow chart of the operation control of the present invention.

Marked in the figure: 1 is the chassis, 2 is the fresh air inlet, 3 is the fresh air outlet, 4 is the primary filter section, 5 is the surface cooling section, 6 is the variable working condition section, 7 is the air outlet section, 8 is the particle concentration sensor, 9 is the humidification section, 41 is the primary filter, 42 is the medium-efficiency filter, 51 is the surface cooler, 61 is the low-resistance wind section, 71 is the first fan, 91 is the humidifier, 611 is the low-resistance channel, and 612 is the The first air valve, 613 is the second air valve, 62 is the deep purification air section, 621 is the deep purification channel, 622 is the main filter, 623 is the third air valve, 624 is the second fan, and C _low is the normal working condition C _high is the concentration boundary value between heavy pollution conditions and moderate pollution conditions.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technology of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the invention.

As shown in FIG. 1 , a variable working condition fresh air unit for dynamic fluctuation of pollution concentration includes a case 1, and the two ends of the case 1 are a fresh air inlet 2 and a fresh air outlet 3 respectively, and the case 1 follows the flow direction of the fresh air. It is divided into primary filter section 4, surface cooling section 5, variable working condition section 6 and air outlet section 7.

In this embodiment, the primary filter section 4 includes a primary filter 41 and an intermediate filter 42 disposed in the chassis 1, and the primary filter 41 and the intermediate filter 42 are spaced in sequence along the flow direction of the fresh air Arrangement, that is, the fresh air entering the chassis 1 from the fresh air inlet 2 is filtered through the primary filter 41 and the intermediate filter 42 in turn; the surface cooling section 5 includes the surface cooler 51 arranged in the chassis 1. The fresh air filtered in section 4 is sent to the surface cooler 51 of the surface cooling section 5 for processing; a humidification section 9 is provided between the surface cooling section 5 and the variable working condition section 6, and the humidification section 9 includes a The humidifier 91 in the case 1, the fresh air in the case 1 passes through the surface cooling section 5 and the humidification section 9 for heat and humidity treatment; the air outlet section 7 includes a first fan 71 arranged in the case 1, the A fan 71 is used to send out the fresh air exhausted from the variable operating condition section 6 from the fresh air outlet 3 .

The variable operating condition section 6 is composed of a low-resistance air section 61 and a deep purification air section 62. The deep purification air section 62 is provided with a main filter 622, which is in front of the air inlet of the variable operating condition section 6. A particle concentration sensor 8 is provided, and the fresh air entering the chassis 1 from the fresh air inlet 2 enters the low resistance air section 61 or all enters the deep purification air section 62 or a part enters the low resistance air section 61 according to the pollution degree detected by the particle concentration sensor 8. , while the other part enters the deep purification air section 62 .

Specifically, the low-resistance wind section 61 includes a low-resistance channel 611 and a first air valve 612 and a second air valve 613 disposed at the openings at both ends of the low-resistance channel 611; the deep purification air section 62 includes a deep purification channel 621 and the main filter 622, the third air valve 623 and the second fan 624 arranged in the deep purification channel 621, the third air valve 623 is arranged at the air inlet end of the deep purification channel 621, the second fan 624 It is arranged at the air outlet end of the deep purification channel 621 and is used to discharge the fresh air filtered by the main filter 622 out of the deep purification channel 621 .

In this embodiment, the low-resistance air section 61 and the deep purification air section 62 of the variable working condition section 6 are arranged along the axial direction of the chassis and are separated into mutually independent ventilation passages. The cross-sectional area A of the deep purification passage 621 ₁ is larger than the cross-sectional area A ₂ of the low-resistance channel 611; an ultraviolet disinfection lamp is installed near the medium-efficiency filter 42 and the main filter 622, which is used to kill bacteria and viruses on the passing air and filter dust, The first fan 71 and the second fan 624 may be AC fans or DC fans.

As shown in Figure 2, a method for controlling the operation of a fresh air unit with variable working conditions for dynamic fluctuation of pollution concentration is as follows:

Under normal working conditions, that is, when C ₀ ≤ C _low , the third air valve 623 is closed, the first air valve 612 and the second air valve 613 are opened, and the fresh air first enters the unit through the fresh air inlet 2, and passes through the primary filter 41 and The medium-efficiency filter 42 is purified, and then the fresh air is subjected to heat and humidity treatment through the surface cooling section 5 and the humidification section 9, and then all the air enters the air outlet section 7 through the low-resistance air section 61, and passes through the first fan 71 from the fresh air outlet 3. send out.

Under moderate pollution conditions, that is, when C _low ≤ C ₀ ≤ C _high , the openings of the first air valve 612 , the second air valve 613 and the third air valve 623 are adjusted according to the air particle concentration detected by the particle concentration sensor 8 and start the second fan 624, the fresh air first enters the unit through the fresh air inlet 2, passes through the primary effect filter 41 and the intermediate effect filter 42 for purification, and then passes through the surface cooling section 5 and the humidification section 9. The fresh air is subjected to heat and humidity treatment , a part of the air flows through the low resistance channel 611, and the other part of the air flows through the deep purification channel 621. After the air in the deep purification channel 621 is filtered by the main filter 622, it is sent out by the second fan 624 and communicated with the low resistance channel 611. After the air is mixed in the air outlet section 7 , it is sent out from the fresh air outlet 3 through the first fan 71 .

In the case of heavy pollution, that is, when C ₀ ≥ C _high , close the first air valve 612 and the second air valve 613, open the third air valve 623, and start the second fan 624, the fresh air first enters the unit through the fresh air inlet 2, It is purified by the primary filter 41 and the intermediate filter 42 in turn, and then the fresh air is subjected to heat and humidity treatment through the surface cooling section 5 and the humidification section 9, and then all the air flows through the deep purification channel 621 and is filtered by the main filter 622. Afterwards, it is sent into the air outlet section 7 by the second fan 624 and sent out from the fresh air outlet 3 through the first fan 71 .

Wherein, the method for determining the cross-sectional area A1 _of the deep purification channel 621 is:

In the formula, Q is the total air volume of the fresh air unit; V ₁ is the surface wind speed of the main filter;

The method for determining the cross _- sectional area A2 of the low-resistance channel 611 is:

where _V2 is the wind speed of the low resistance channel.

When operating under moderate pollution conditions, according to the air particle concentration detected by the particle concentration sensor 8 as C ₀ , the openings of the first air valve 612 , the second air valve 613 and the third air valve 623 are adjusted, and the second air valve 623 is adjusted. The operating frequency of the fan 624 is such that the air flow of the deep purification channel 621 is Q ₁ , and the air flow of the low resistance channel 611 is Q ₂ , and meets the requirements of the following formula:

Q=Q ₁ +Q ₂

In the formula, C _n is the concentration of air particles sent into the room by the fresh air outlet; η _z is the efficiency of the main filter; C _b is the standard allowable particle concentration.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. within.

Claims (10)

1. A fresh air unit with variable working conditions for the dynamic fluctuation of pollution concentration, comprising a case (1), the two ends of the case (1) are respectively a fresh air inlet (2) and a fresh air outlet (3), it is characterized in that: The chassis (1) is divided into a primary filter section (4), a surface cooling section (5), a variable working condition section (6) and an air outlet section (7) in turn along the flow direction of the fresh air. The variable working condition section (6) It consists of a low resistance air section (61) and a deep purification air section (62). The deep purification air section (62) is provided with a main filter (622). A particulate matter concentration sensor (8) is arranged in front, and the fresh air entering the chassis (1) from the fresh air inlet (2) all enters the low-resistance air section (61) or all enters the deep purification according to the pollution level detected by the particulate matter concentration sensor (8). One part of the wind section (62) enters the low resistance wind section (61), while the other part enters the deep purification wind section (62). 2. The variable working condition fresh air unit according to claim 1, wherein the primary filter section (4) comprises a primary filter (41) arranged in the chassis (1) and a The medium-efficiency filter (42), the primary-efficiency filter (41) and the medium-efficiency filter (42) are arranged at intervals along the flow direction of the fresh air, that is, the fresh air entering the chassis (1) from the fresh air inlet (2) passes through the primary filter in turn. The high-efficiency filter (41) and the medium-efficiency filter (42) are used for filtering. 3. The variable working condition fresh air unit according to claim 2, characterized in that: the surface cooling section (5) comprises a surface cooler (51) arranged in the chassis (1), which is composed of The fresh air filtered in the primary filter section (4) is sent to the surface cooler (51) of the surface cooling section (5) for processing. 4. The variable working condition fresh air unit according to claim 3, characterized in that: a humidification section (9) is provided between the surface cooling section (5) and the variable working condition section (6). ), the humidification section (9) includes a humidifier (91) arranged in the casing (1), and the fresh air in the casing (1) is subjected to heat and humidity treatment through the surface cooling section (5) and the humidification section (9). . 5 . The variable working condition fresh air unit according to claim 1 , wherein the air outlet section ( 7 ) comprises a first fan ( 71 ) arranged in the casing ( 1 ), so that the The first fan (71) is used to send out the fresh air discharged through the variable operating condition section (6) from the fresh air outlet (3). 6. The variable working condition fresh air unit according to any one of claims 1 to 5, wherein the low-resistance wind section (61) comprises a low-resistance channel (611) and a A first air valve (612) and a second air valve (613) at the openings at both ends of the low resistance channel (611). 7. The variable working condition fresh air unit according to claim 6, wherein the deep purification air section (62) comprises a deep purification channel (621) and is arranged in the deep purification channel (621) The main filter (622), the third air valve (623) and the second fan (624) inside, the third air valve (623) is arranged at the air inlet end of the deep purification channel (621), the second air The fan (624) is arranged at the air outlet end of the deep purification passage (621), and is used for discharging the fresh air filtered by the main filter (622) out of the deep purification passage (621). 8. The variable working condition fresh air unit according to claim 7, characterized in that: the low resistance wind section (61) and the deep purification wind section (62) of the variable working condition section (6) All are arranged along the axial direction of the chassis and are separated into mutually independent ventilation channels, and the cross-sectional area A ₁ of the deep purification channel (621) is larger than the cross-sectional area A ₂ of the low-resistance channel (611). 9. The operation control method of the variable working condition fresh air unit for the dynamic fluctuation of pollution concentration according to claim 1 to 8 is characterized in that: the specific control method is: In normal working conditions, close the third air valve (623), open the first air valve (612) and the second air valve (613), the fresh air first enters the unit through the fresh air inlet (2), and then passes through the primary filter ( 41) and the medium-efficiency filter (42) are purified, and then the fresh air is subjected to heat and humidity treatment through the surface cooling section (5) and the humidification section (9), and then all the air enters the air outlet section (61) through the low-resistance air section (61). 7), and sent out from the fresh air outlet (3) through the first fan (71); Under moderate pollution conditions, the openings of the first air valve (612), the second air valve (613) and the third air valve (623) are adjusted according to the air particle concentration detected by the particle concentration sensor (8), And start the second fan (624), the fresh air first enters the unit through the fresh air inlet (2), passes through the primary efficiency filter (41) and the intermediate efficiency filter (42) for purification, and then passes through the surface cooling section (5) and humidification. Section (9) heats and humidifies the fresh air, part of the air flows through the low-resistance channel (611), and the other part of the air flows through the deep purification channel (621), and the air in the deep purification channel (621) passes through the main filter (621). 622) After filtering, the air sent out by the second fan (624) and mixed with the air of the low-resistance channel (611) in the air outlet section (7) is sent out from the fresh air outlet (3) through the first fan (71); In the case of heavy pollution conditions, close the first air valve (612) and the second air valve (613), open the third air valve (623), and start the second air blower (624), and the fresh air is first driven by the fresh air inlet (2) After entering the unit, it is purified by the primary efficiency filter (41) and the medium efficiency filter (42) in turn, and then the fresh air is subjected to heat and humidity treatment through the surface cooling section (5) and the humidification section (9), and then all the air flows through the depth The purification channel (621), after being filtered by the main filter (622), is fed into the air outlet section (7) by the second fan (624), and sent out from the fresh air outlet (3) by the first fan (71). 10. The variable working condition fresh air unit according to claim 9, characterized in that: the method for determining the cross-sectional area A1 _of the deep purification passage (621) is: A ₁ ≥Q/V ₁ In the formula, Q is the total air volume of the fresh air unit; V ₁ is the surface wind speed of the main filter; The method for determining the cross _- sectional area A2 of the low resistance channel (611) is: A ₂ ≥Q/V ₂ In the formula, Q is the total air volume of the fresh air unit; V ₂ is the wind speed of the low resistance channel; During operation under moderate pollution conditions, according to the air particle concentration detected by the particle concentration sensor (8) as C ₀ , by adjusting the first air valve (612), the second air valve (613) and the third air valve (623) and adjust the operating frequency of the second fan (624) so that the air flow rate of the deep purification channel (621) is Q ₁ and the air flow rate of the low resistance channel (611) is Q ₂ , and the requirements of the following formulas are satisfied: Q=Q ₁ +Q ₂ C _n =[C ₀ ×Q ₁ +C ₀ ×Q ₂ ×(1-η _z )]/(Q ₁ +Q ₂ )≤C _b In the formula, C _n is the concentration of air particles sent into the room by the fresh air outlet; η _z is the efficiency of the main filter; C _b is the standard allowable particle concentration.

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